[OSM-talk] Roundabouts - why is a separate segment required?

Dave F davefoxfac63 at btinternet.com
Thu Feb 15 17:20:08 UTC 2018



On 14/02/2018 20:19, Matej Lieskovsk√Ĺ wrote:
> If two ways enter a roundabout at the same point, you can turn from
> road A into road B instantly,
> but going from B to A will require going around the entire roundabout.
> For a router to detect this, it would have to check (for every
> encountered node):

But "going around the entire roundabout" is what always happens.

For clarity I'm reposting an example as many appear to misunderstand my PoV:

https://www.openstreetmap.org/node/5408566797

> 1) is this a part of a roundabout?
> 2) if yes, which of the turns I can make here would require going
> around the roundabout?

These are tests that are performed even with segments between entrance & 
exit & so makes your points irrelevant to my point.

> The current tagging of a one-way circular way is much easier for
> routing software to deal with
> and is conceptually "cleaner".

Who said *anything* about changing tagging?

DaveF
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